This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A263959 #36 Feb 16 2025 08:33:27
%S A263959 1,2,4,355,499,1171,1543,5719
%N A263959 Number of decimal digits in A069151(n).
%C A263959 Subset of A227530 (Copeland-Erdős constant primes) corresponding to concatenation of a full (non-truncated) final prime.
%C A263959 a(9) > 459970. - _Eric W. Weisstein_ (according to Mark Rodenkirch as of Nov 21 2015)
%H A263959 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConsecutiveNumberSequences.html">Consecutive Number Sequences</a>
%H A263959 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a>
%H A263959 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Smarandache-WellinPrime.html">Smarandache-Wellin Prime</a>
%t A263959 Cases[FromDigits /@ Rest[FoldList[Join, {}, IntegerDigits[Prime[Range[10^3]]]]], p_?PrimeQ :> IntegerLength[p]]
%o A263959 (PARI) p=""; for(n=1, 1e4, p=concat(p, prime(n)); if(ispseudoprime( eval(p)), print1(#Str(p)", "))) \\ _Altug Alkan_, Oct 30 2015
%Y A263959 Cf. A019518, A046035, A069151.
%Y A263959 Cf. A227529 (Copeland-Erdős constant primes).
%Y A263959 Cf. A227530 (decimal digits in n-th Copeland-Erdős constant prime).
%K A263959 nonn,base,more
%O A263959 1,2
%A A263959 _Eric W. Weisstein_, Oct 30 2015